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        <a href="/2021/05/03/%E6%89%8B%E6%92%95%E6%8E%92%E5%BA%8F%E7%AE%97%E6%B3%95/">手撕排序算法</a>
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          手撕排序算法冒泡排序时间复杂度O(n*n)，空间复杂度O(n)，稳定排序

//冒泡排序——每次把数组无序部分的最大值交换到数组最末尾
public static void bubbleSort(int[] nums)&#123;
    int len = nums.length;
    //记录上一次最后完成交换的位置，因为后面的已经有序了，这样可以避免无意义的比较判断
    int la
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          京东笔试206-反转链表
/**
 * Definition for singly-linked list.
 * public class ListNode &#123;
 *     int val;
 *     ListNode next;
 *     ListNode() &#123;&#125;
 *     ListNode(int val) &#123; this.val = v
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          Netty是什么？概述——JBOSS提供的一个开源的Java网络应用框架
特点——异步，基于事件驱动。提供了TCP/IP、HTTP协议栈，方便定制开发私有协议栈
本质——NIO框架
应用——开发高性能高可靠的网络IO程序，例如在分布式系统中作为RPC的基础通信组件。另外在大数据领域也被广泛应用，Akka，Flink，Spark等项目都用到了Netty
数据传输的基础——TCP协议
下图可以帮助了解
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        <a href="/2021/05/03/JUC%E5%B9%B6%E5%8F%91%E9%94%81/">
          
          
            
          
          Java并发锁整理各种锁的概念显示锁 vs 内置锁(隐式锁)




显示锁(JDK1.5之后才有)
内置锁(隐式锁)




锁的控制对象
锁的申请和释放都可以由程序所控制
锁的申请和释放都是由 JVM 所控制


实现
ReentrantLock、ReentrantReadWriteLock
synchronized


优化趋势
无
JDK1.6之后对synchronized做了大量优化，性
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        <a href="/2021/04/06/MySQL%E7%B4%A2%E5%BC%95%E8%AF%A6%E8%A7%A3/">MySQL索引详解</a>
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          MySQL索引什么是索引？官方定义一种帮助MySQL提高查询效率的数据结构。
索引的优点大大加快数据的查询速度
索引的缺点创建索引是为产生索引文件的，占用磁盘空间。索引文件是一个二叉树类型的文件，可想而知我们的DML操作，对表记录的增、删、改操作同样也会对索引文件进行修改，所以性能会相应的有所下降。
索引的分类(INNODB)
主键索引将表属性设定为主键后，数据库会自动为主键创建聚簇索引。
单值索
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        <a href="/2021/04/06/ThreadLocal%E8%AF%A6%E8%A7%A3/">ThreadLocal详解</a>
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          ThreadLocalThreadLocal 主要用来提供线程局部变量，将参数储存在线程中，然后在该线程运行的任何阶段都能从线程中获取。多线程环境下，每个线程都可以通过set()和get()来对本线程局部变量进行操作，不会和其他线程的局部变量发生冲突，实现了线程间的数据隔离。
原理

每一个Thread对象都包含一个ThreadLocalMap类型的成员变量threadLocals，它存储了本线程
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        <a href="/2021/04/05/Zookeeper%E5%85%A5%E9%97%A8%E5%AD%A6%E4%B9%A0/">Zookeeper入门学习</a>
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          Apache ZooKeeperZK简介一个分布式的，开源的分布式应用程序协调服务，是Google的分布式锁服务Chubby的一个开源实现，是Hadoop和Hbase的重要组件。ZK由Java编写，但是支持Java和C两种编程语言。

在Dubbo、SpringCloud中，担任服务注册中心的角色
在Hadoop、Hbase等大数据的组件中，担任集群管理者的角色
在Redis分布式开发中，担任实现
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        <a href="/2021/01/25/leetcode%E9%A2%98%E8%A7%A3%E4%B9%8B%E6%95%B0%E7%BB%84/">leetcode题解之数组</a>
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          1480.一维数组的运行和题解class Solution &#123;
    int sum = 0;
    public int[] runningSum(int[] nums) &#123;
        for (int i = 0; i &lt; nums.length; i++)&#123;
            sum += nums[i];
            nums
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        <a href="/2021/01/21/leetcode%E9%A2%98%E8%A7%A3%E4%B9%8B%E9%93%BE%E8%A1%A8/">leetcode题解之链表</a>
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        <a href="/2021/01/21/leetcode%E9%A2%98%E8%A7%A3%E4%B9%8B%E9%93%BE%E8%A1%A8/">
          
          
            
          
          1290.将链表中的二进制值转成整数题解class Solution &#123;
    public int getDecimalValue(ListNode head) &#123;
        int sum = 0;
        int cnt = -1;
        ListNode p = head;
        while (p != null)&#123;
   
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          938.二叉搜索树的范围和题解class Solution &#123;
    int sum = 0;
    public int rangeSumBST(TreeNode root, int low, int high) &#123;
        if (root == null) return 0;
        if (root.val &gt;= low &amp;&amp; 
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